Union Home Minister Rajnath Singh and Uttar Pradesh Chief Minister Yogi Adityanath on Tuesday flagged off Lucknow Metro. But on the first day, the 8.5 km stretch 'Priority Corridor' developed some major fault which resulted in 20 minutes delay. The commuters were stuck inside the metro for around 20 minutes on its first public run. They started panicking since the light and AC went off. The commuters were stuck inside the metro for around 20 minutes on its first public run. They started panicking since the light and AC went off.